To build iText, Maven must be installed: http://maven.apache.org/
Running install without a profile will generate the itextpdf jar:
mvn install
When using the profile 'all' also the source and javadoc jars will be generated:
mvn install -P all
If you are in need of the asian font jars, you can run one of the following commands:
mvn clean install -f itext-asian.pom
mvn clean install -f itext-asiancmaps.pom
If you need the hyphenation jar, execute:
mvn clean install -f itext-hyph-xml.pom